A yellow color marked tube is primarily used for which purpose?

A yellow color marked tube typically signifies that it is intended for drainage, waste, and vent (DWV) applications. This identification helps plumbing professionals quickly recognize the purpose of the pipe in installations. DWV systems are essential for draining wastewater away from buildings and managing the venting of sewer gases.

Color coding in pipe fitting is crucial for ensuring that the right materials are used in the correct applications, which helps to prevent potential issues related to improper fittings. In this case, yellow marking specifically indicates that a tube is designed for the safe and effective handling of drainage waste, which requires certain material properties not typically found in other types of tubes.

In contrast, type M copper tubes are used for low-pressure applications, type K tubes are more suited for heavy duty plumbing, and ACR tubes are dedicated to air-conditioning and refrigeration systems. Each of these has its specific color coding and applications that differ from the purpose associated with the yellow-marked DWV tube.